Of all the exercises that I do, swimming is the best. I now only swim laps, but more importantly do my entire workout in the pool! I jog, I do strength training, flexibility exercises, aerobic workouts, etc. By doing it in the water, I put almost no force on my joints which is crucial. I cannot say enough about how important this is. Many people say it is too much work to do this but if you plan ahead, get your gear together all the time, etc. you will find it is no different than any other type of exercise. Give it a try...